Thermal Decomposition Kinetics of Ni(II) Chelates of Substituted Chalcones

Abstract

The thermal decomposition of Ni(II) complexes of 3‐(phenyl)‐1‐(2’‐hydroxy‐naphthyl)‐2‐propen‐1‐one (PHPO), 3‐(4‐chlorophenyl)‐1‐(2’‐hydroxy‐naphthyl)‐2‐propen‐1‐one(CPHPO), 3‐(4‐methoxyphenyl)‐1‐(2’‐hydroxynapthyl)‐2‐propen‐1‐one (MPHPO), 3‐(3,4‐dimethoxyphenyl)‐1‐(2’‐hydroxynaphthyl)‐2‐propen‐1‐one(DMPHPO) was studied by thermogravimetry. Mathematical analysis of the data has allowed us to determine various parameters using Freeman‐Carroll equation, the integral method using the coats‐Redfern equation and the approximation method using the Horowitz‐Metzger equation. The trend of the kinetic parameters was found to be different from that of the thermal stability order. The low values of Z suggest the slow nature of the reaction.